tutorials.cz - dns.ninja

`tutorials.cz`

DNSSEC	⚠️ Not signed
A	185.28.193.57^{🇨🇿 GRANSY185.28.193.0/24 Network of Gransy s.r.o.}
		PTR	`s04.station.cz`
NS	`ns2.gransy.com` ⭐ ⚠️ Not in parent delegation
		A	2001:19f0:6801:474:5400:1ff:fec5:8efb^{🇫🇷 AS-VULTR2001:19f0:6800::/38 Vultr Assigned Prefix}
		A	2001:19f0:7401:81e0:5400:1ff:fec5:8ef6^{🇬🇧 AS-VULTR2001:19f0:7400::/38 Vultr Assigned Prefix}
		A	95.179.192.121^{🇬🇧 AS-VULTR95.179.192.0/20 Vultr Assigned Prefix}
			PTR	`95.179.192.121.vultrusercontent.com`
		A	217.16.185.221^{🇨🇿 VSHOSTING217.16.176.0/20 III.}
			PTR	`ns2.gransy.com`
		A	217.69.4.49^{🇫🇷 AS-VULTR217.69.0.0/20 Vultr Assigned Prefix}
			PTR	`217.69.4.49.vultrusercontent.com`
NS	`ns.gransy.com` ⚠️ Not in parent delegation
		A	2001:19f0:5001:1caf:5400:1ff:fec5:8d50^{🇳🇱 AS-VULTR2001:19f0:5000::/38 Vultr Assigned Prefix}
		A	45.76.90.43^{🇩🇪 AS-VULTR45.76.80.0/20 Vultr Assigned Prefix}
			PTR	`45.76.90.43.vultrusercontent.com`
		A	77.78.104.149^{🇨🇿 CASABLANCA-AS77.78.96.0/20 Casablanca INT}
			PTR	`ns.gransy.com`
		A	95.179.136.180^{🇳🇱 AS-VULTR95.179.128.0/20 Vultr Assigned Prefix}
			PTR	`95.179.136.180.vultrusercontent.com`
NS	`ns.internetserver.cz` ⚠️ Not in zone NS records
		A	45.76.90.43^{🇩🇪 AS-VULTR45.76.80.0/20 Vultr Assigned Prefix}
			PTR	`45.76.90.43.vultrusercontent.com`
		A	95.179.136.180^{🇳🇱 AS-VULTR95.179.128.0/20 Vultr Assigned Prefix}
			PTR	`95.179.136.180.vultrusercontent.com`
NS	`ns2.internetserver.cz` ⚠️ Not in zone NS records
		A	95.179.192.121^{🇬🇧 AS-VULTR95.179.192.0/20 Vultr Assigned Prefix}
			PTR	`95.179.192.121.vultrusercontent.com`
		A	217.16.185.221^{🇨🇿 VSHOSTING217.16.176.0/20 III.}
			PTR	`ns2.gransy.com`
		A	217.69.4.49^{🇫🇷 AS-VULTR217.69.0.0/20 Vultr Assigned Prefix}
			PTR	`217.69.4.49.vultrusercontent.com`
NS	`ns3.dns-station.net` ⚠️ Not in zone NS records
		A	46.21.100.103^{🇳🇱 GLESYS46.21.100.0/24 GleSYS AB}
			PTR	`46-21-100-103-static.glesys.net`
		A	109.74.7.71^{🇸🇪 GLESYS109.74.0.0/20}
			PTR	`109-74-7-71-static.glesys.net`
NS	`ns3.gransy.com` ⚠️ Not in parent delegation
		A	2a02:750:7::2e7^{🇸🇪 GLESYS2a02:750::/29}
			PTR	`2a02-750-7--2e7-static.glesys.net`
		A	2a02:750:8::32^{🇳🇱 GLESYS2a02:750:8::/48 GleSYS AB}
			PTR	`2a02-750-8--32-static.glesys.net`
		A	46.21.100.103^{🇳🇱 GLESYS46.21.100.0/24 GleSYS AB}
			PTR	`46-21-100-103-static.glesys.net`
		A	77.78.126.35^{🇨🇿 CASABLANCA-AS77.78.124.0/22 Casablanca INT}
		A	109.74.7.71^{🇸🇪 GLESYS109.74.0.0/20}
			PTR	`109-74-7-71-static.glesys.net`
NS	`ns4.gransy.com` ⚠️ Not in parent delegation
		A	2001:19f0:5401:69b:5400:1ff:fec5:8f3f^{🇺🇸 AS-VULTR2001:19f0:5400::/38 Vultr Assigned Prefix}
		A	2a00:1a28:2010:1::89^{🇳🇴 GLESYS2a00:1a28::/32 Portlane Network}
			PTR	`2a00-1a28-2010-1--89-static.glesys.net`
		A	66.42.94.136^{🇺🇸 AS-VULTR66.42.80.0/20 Vultr Assigned Prefix}
			PTR	`66.42.94.136.vultrusercontent.com`
		A	80.67.7.209^{🇳🇴 GLESYS80.67.0.0/20 Portlane Network}
			PTR	`80-67-7-209-static.glesys.net`
NS	`ns5.gransy.com` ⚠️ Not in parent delegation
		A	2a02:750:5::538^{🇸🇪 GLESYS2a02:750::/29}
			PTR	`2a02-750-5--538-static.glesys.net`
		A	31.192.227.223^{🇸🇪 GLESYS31.192.224.0/21}
			PTR	`31-192-227-223-static.glesys.net`
MX	`mx.internetserver.cz` ⭐
		A	185.28.193.36^{🇨🇿 GRANSY185.28.193.0/24 Network of Gransy s.r.o.}
			PTR	`mail.gransy.cz`
TXT	`v=spf1 a mx include:gransy.com`
SOA	`ns.gransy.com`root@gransy.com serial=2753308454

`cz`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.ns.nic.cz` ⭐
	NS	`b.ns.nic.cz`
	NS	`c.ns.nic.cz`
	NS	`d.ns.nic.cz`
	SOA	`a.ns.nic.cz`hostmaster@nic.cz serial=1781439436

WOT: SAFE (86/100)

Subdomains

mgate1-backup.tutorials.cz

Same first word

Similar names

DNS History

11 records (10 active, 1 former)

●NSns.gransy.com2026-06-13 → 2026-06-14 · 3 obs

○ 2015-05-18 21:45:06
● 2026-06-13 08:55:08
● 2026-06-14 12:54:50

●NSns.internetserver.cz2015-05-18 → 2026-06-14 · 2 obs

● 2015-05-18 21:45:06
● 2026-06-14 12:54:50

●NSns2.gransy.com2026-06-13 → 2026-06-14 · 3 obs

○ 2015-05-18 21:45:06
● 2026-06-13 08:55:08
● 2026-06-14 12:54:50

●NSns2.internetserver.cz2015-05-18 → 2026-06-14 · 2 obs

● 2015-05-18 21:45:06
● 2026-06-14 12:54:50

●NSns3.dns-station.net2015-05-18 → 2026-06-14 · 2 obs

● 2015-05-18 21:45:06
● 2026-06-14 12:54:50

●NSns3.gransy.com2026-06-13 → 2026-06-14 · 3 obs

○ 2015-05-18 21:45:06
● 2026-06-13 08:55:08
● 2026-06-14 12:54:50

●NSns4.gransy.com2026-06-13 → 2026-06-14 · 3 obs

○ 2015-05-18 21:45:06
● 2026-06-13 08:55:08
● 2026-06-14 12:54:50

●NSns5.gransy.com2026-06-13 → 2026-06-14 · 3 obs

○ 2015-05-18 21:45:06
● 2026-06-13 08:55:08
● 2026-06-14 12:54:50

●MXmx.internetserver.cz2015-05-18 → 2026-06-14 · 2 obs

● 2015-05-18 21:45:06
● 2026-06-14 12:54:50

●A185.28.193.572026-06-13 → 2026-06-14 · 3 obs

○ 2017-05-17 05:50:26
● 2026-06-13 08:55:08
● 2026-06-14 12:54:50

○A77.78.126.242015-05-18 → 2017-05-17 · 4 obs

● 2015-05-18 21:45:06
● 2017-05-17 05:50:26
○ 2026-06-13 08:55:08
○ 2026-06-14 12:54:50

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz, a.ns.nic.cz	-
tutorials.cz	ns.internetserver.cz, ns2.internetserver.cz, ns3.dns-station.net	-

✅ Authoritative Response

Server:217.69.4.49

NS records: ns.internetserver.cz, ns2.internetserver.cz, ns3.dns-station.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for tutorials.cz (unsigned zone)

⏱️ Timing

Total: 2103ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`185.28.193.57`
NS	5	`ns2.gransy.com, ns3.gransy.com...`
MX	1	`mx.internetserver.cz (pri: 10)`
TXT	1	`v=spf1 a mx include:gransy.com`
SOA	1	`ns.gransy.com root.gransy.com`

Analysis

Hierarchy

The domain mgate1-backup.tutorials.cz falls under the parent tutorials.cz.

IP Addresses

tutorials.cz resolves to one IP address: 185.28.193.57.

velkoplosny-tisk.net, turecek.eu, postav.eu and two other host names share IP numbers with tutorials.cz.

Name Servers

tutorials.cz has 8 name servers — ns2.gransy.com, ns3.gransy.com, ns4.gransy.com and 5 others.

At least some of tutorials.cz's name servers are shared with other domains, for example einfo.cz, wp-hosting.org, viatherm.cz and two more.

It is common to find these name servers alongside the name servers ns5.gransy.com, ns.gransy.com, ns2.internetserver.cz and two others.

Hostnames pointing to five IP numbers:

ns2.gransy.com resolves to four IP addresses: 95.179.192.121, 217.16.185.221, 217.69.4.49 and two others.

ns3.gransy.com resolves to four IP addresses: 46.21.100.103, 77.78.126.35, 109.74.7.71 and two others.

Hosts that point to four IP numbers:

ns4.gransy.com directs to 66.42.94.136, 80.67.7.209, 2001:19f0:5401:69b:5400:1ff:fec5:8f3f and 2a00:1a28:2010:1::89.

ns.gransy.com directs to 45.76.90.43, 77.78.104.149, 95.179.136.180 and 2001:19f0:5001:1caf:5400:1ff:fec5:8d50.

Hostnames that resolve to three IP addresses:

ns2.internetserver.cz resolves to 95.179.192.121, 217.16.185.221 and 217.69.4.49.

Hostnames that resolve to two IP addresses:

ns5.gransy.com resolves to 31.192.227.223 and 2a02:750:5::538.

ns.internetserver.cz resolves to 45.76.90.43 and 95.179.136.180.

ns3.dns-station.net resolves to 46.21.100.103 and 109.74.7.71.

The host names ns2.gransy.com and ns2.internetserver.cz both resolve to 95.179.192.121 IP addresses.

The host names ns2.gransy.com and ns2.internetserver.cz both resolve to 217.16.185.221 IP addresses.

The host names ns2.gransy.com and ns2.internetserver.cz both resolve to 217.69.4.49 IP addresses.

The host names ns3.gransy.com and ns3.dns-station.net both resolve to 46.21.100.103 IP addresses.

The host names ns3.gransy.com and ns3.dns-station.net both resolve to 109.74.7.71 IP addresses.

The host names ns.gransy.com and ns.internetserver.cz both resolve to 45.76.90.43 IP addresses.

The host names ns.gransy.com and ns.internetserver.cz both resolve to 95.179.136.180 IP addresses.

Mail Servers

Mail for tutorials.cz is handled by a single mail server, mx.internetserver.cz.

tutorials.cz uses an identical mail server configuration to several other domains — among them siebdruck-maschinen.eu, mkr-group.eu, zemezeme.cz and two more.

tutorials.cz has at least partial mail server overlap with other domains such as mises.cz, radoxist.com, spaceorigin.com and two more.

mx.internetserver.cz points to one IP number — 185.28.193.36.